What is Mesterolone (Proviron)?

Proviron is an oral androgen that's been around since the 1960s. It was originally developed to treat low testosterone and male fertility issues. These days it's widely used in performance circles for its unique ability to support other compounds in a cycle.

Quick Facts

How Does It Work?

Mesterolone binds to androgen receptors and acts as an anti-estrogen by blocking aromatase — the enzyme that converts testosterone into estrogen. This keeps estrogen levels lower during a cycle. It also binds to sex hormone binding globulin (SHBG), which frees up more testosterone in the bloodstream to do its job.

What It's Used For

• Controlling estrogen levels during anabolic steroid cycles
• Increasing free testosterone by reducing SHBG binding
• Improving muscle hardness and definition during a cut

What to Expect

Proviron won't pack on significant mass by itself — that's not what it's for. Instead, expect a harder, drier look, improved libido, and better results from the other compounds in your cycle. Most users notice a noticeable boost in mood and sex drive within the first week.

Possible Side Effects

• Increased hair loss in those predisposed to male pattern baldness
• Suppression of natural testosterone production at higher doses
• Acne or oily skin, especially at doses above 50mg per day

Cycle & Dosage Notes

Proviron is typically run at 25–50mg per day throughout the length of a cycle, usually 8–12 weeks. It works well alongside testosterone, making it a popular addition to most base cycles. Because it has mild suppressive effects, standard PCT protocols still apply at the end of your cycle.

Storage

Keep at room temperature (15–25°C), away from light and moisture. Leave in the original packaging.

This info is for research and educational purposes only. Check the laws in your country before ordering.